Pliers



fizz/8711607; (Jafl QAndemson;

C. O. ANDERSON 'PLIERS Filed June 13 isAttorngy Sept. 18, 1923.

Patented Sept. 18, 1923. r

caries; stares- GAB]; o. ANDERsomfoF-BnooKLYiIjnEW Yoak. g

Application filed June 13,

have invented certain new and useful Im provements 1n Pliers, of which the following is a specificationv This invention relates to pliers, and one object of my improvements is to'provide a tool of the character specifiedwherein the fulcrum between I the two membersof'the tool isshifted during the use of the tool. Other objects will appear later herein.

As one embodiment of the invention, my improved pliers are'illustrate'd in the drawing accompanying this specification as particularly adapted for use-as'a cotter pin puller. In its illustrated form, which may be the preferred embodiment of my improvements, said pliers are also efficient for pulling staples and for removing and expanding piston rings. Other uses will be obvious to those skilled in the art.

Figure l of the drawing is a side elevation, partly in section, of my improved pliers as applied to the removal of a cotter pin. Fig. 2 is a fragmentary elevation similar to that of Fig. 1 showing a succeeding step in the operation of the tool. Figs. 3 and. 4 are fragmentary side elevations, respectively, showing further steps in the operation of said tool. Fig. 5 is a front elevation corresponding with Fig. 3. All the views are to one scale. I

For purposes of economic manufacture my improved pliers are preferably made up of sheet metal, such as steel, the lower arm 2 being of U shaped cross section and terminating at its operative end in work engaging means such as opposite feet 3, 3. The rear or handle end of arm 2 may be of blade-like formation, as at 2*, to serve asa screw driver, lever, or the like. Thehandle'portion 4 of upper arm 10 is also preferably of U shaped cross section, and to that portion thereof nearest feet 3, 3 of arm2 is fixed nose piece 5, preferably byriveting between side walls 4, 4*, thereof. Said nose piece 5 terminates at its operative end in a workengaging horn or nose 5*, projecting slightly beyond feet 3, 3 of arm 2 and adapted for entering the eye, as 6 of a cotter pin 6.

The following means are provided for connecting arms 2 and 10: A short distance backwardly from said nose 5, member 5 is pliersl 7 1922. errano. 567,918;

'p'rovidedfwithfan opening 7', preferably in the form of a transverseslot, through which -,1 passes fulcrum 'pin 8 secured in theop-posite walls of aimA-Q. The'lower edges of side walls 4 45 0f member 4:, curve upwardly at their forward ends, respectively, whereby opposite cams-are formed, and the upper, edgesof side walls aa-aeofarm 2are' i-"n--- 'clined downwardly from near,v fulcru-n-1'*8v toward handle en d'2 g forming; tracks for said cams, whereby coacting rolling seats are provided on said members'i2 and -4, for

purposes more fully set forthin-the descrip tron of the operation of -'my' improved The; operation ofniy improved'pliers as follows: The handle ends of arms 2" and 10 being separatedlas far as-may be,'{see'= Fig; 1. the lower portion of slot'T engages pin 8 whereby horn 5 is depressed to the.

level of, or below, the points of feet '3, 3,"

thereby permitting the entrance of said horn within the eye 6 of the low-lying head of;

cotter pin 6. If now. handle 10 be depressed toward handle 2, pin 8 'will presently be engaged by the upper end of slot 7 as a fulcrum, Fig.2, whereby cotter pin 6 will be started from its seat under maximum leverage. I Upon further depression of handle 10, cams 4 engage their respective tracks 2 first, just above pin 8, Fig. 2,'then rolling down said tracks at X, Fig. 3, and later at Y, Fig. 4:, slot permitting said movement ofmember 5 relative to pin 8. It will be observed that said movement of handle 1O relatively to handle 2, throws the fulcrum point constantly backward to the left,'thereby decreasing the leverage'for lifting pin 6, but constantly increasing the'movement' of nose 5 from feet 3,3, relatively to the move' ment of handle 10. Thus, at'the commencement of the operation, when pin 6 is firmly seated, maximum leverage is had and, after the pin isstarted from its seat, that leverage decreases and the speedand stroke of lifting is correspondingly increased, thereby providing a very efiicient action.

Iclaim: V 1. A tool of the character described including in combination an upper. arm and a lower arm, each of said arms l'iaving work engaging means, said arms beingponnected V V by means of apivot pincarried ,byl'one of saidarms and a transverse slot in the other arm through whichsald pin passes, a, downwardly facing cam on said-upper arm and l an upwardly facing track on said lower arm, for engagement by sa1d cannthe upper end of said slot at one time engaging said pin as a fulcrum and at another time said fulcrum lying between said cam andftrack.

2. A tool of the character described in eluding in combination an upper arm and a lower arm, each of said arms having work engaging means, said arms being connected by means of a pivot pin carried by one of said a-rms and a transverse slot in the other arm through which said pin passes, a downwardly tacingcam on said upper arm and an upwardly facing track on said lower arm. for engagement bysaid cam, the upper endof said slot at one time engaging said pin as a fulcrum, whereby during one part of the operation of said'tool the: fulcrum of said arms is on said pivot pin and later is shifted rearwardly therefrom to between said cam and track.

3. A tool of the character described in 'cluding in combination an upperiarm and a.

lower arm, each of said arms having Work ongaging means, said arms being connected by means of a pivot pin carried by one of said arms and a transverse slot in the other arm through which said pin passes, a downwardly facing cam on said upper arm and an upwardly facing track on said lower arm for engagement by said cam, whereby 1n operatlon the lower portion of said slot first engages said pivot pin, then theupper end of said'slot'engages said pin as a fulcrum and later the fulcrum of said arms is shifted rearwardly from'said pin to. between said cam and tracln 1 v r q 4. In a tool of the characterdescribed the combinationiof an upper arm and a lower]v 7 arm, each of said arms having work engaging means, a pivot pincarried by onearm and passing through a transverse slot in the other arm, and means on said arms operable to vary the degree of leverage applied to said work engaging means while the tool isin operatlon.

5. In a tool of thecharacter, described the combination of anv upper arm and alower arm, each of said arms having work engaging means, a pivot pin carried by'one arm and passingthrough a transverse slot in the 7 other arm, and means on said armsoperable to shift the point of fulcrum relatively: to, said work engaging means while the tool is,

in operation.

In witness whereof, I hereby affix my Sig nature, this 9th day of June, 1922.

CARL o. ANDERSON; 

